CN109938726B

CN109938726B - Electrode fixing device

Info

Publication number: CN109938726B
Application number: CN201910277513.XA
Authority: CN
Inventors: 张黎; 冉欣; 孙清; 李云丹
Original assignee: Chinese Peoples Liberation Army Army Specialized Medical Center
Current assignee: Chinese Peoples Liberation Army Army Specialized Medical Center
Priority date: 2019-04-08
Filing date: 2019-04-08
Publication date: 2021-07-27
Anticipated expiration: 2039-04-08
Also published as: CN109938726A

Abstract

The invention discloses an electrode fixing device, comprising: fixing base and vacuum chuck, the fixing base is connected in vacuum chuck's the back and the partial absorption face that outstanding to vacuum chuck, the tip that is located vacuum chuck absorption face of fixing base is provided with the fixed slot, electrode detachable install in the fixed slot and with the sealed cooperation of fixed slot, and the outer end position of electrode is less than the distance to the arcwall face edge to the distance on vacuum chuck arcwall face summit, the connecting wire of electrode passes the fixing base and extends outside vacuum chuck's the back. The electrode fixing device adopting the structure can meet the electroencephalogram examination requirements of infants, accurately and stably positions the electrodes, and is convenient to operate.

Description

Electrode fixing device

Technical Field

The invention relates to the technical field of electroencephalogram examination, in particular to an electrode fixing device.

Background

Electroencephalogram examination means commonly used in modern medicine are that electroencephalogram examination items are often set for newborn and premature infants in many hospitals at present so as to ensure the health condition of the infants. Before recording the electroencephalogram, the electrodes need to be fixed on the scalp, the accuracy and stability of the electrode position fixing directly affect the quality of electroencephalogram recording, and if the electrodes are not firmly fixed, the electrodes shift in the inspection process, so that the interference is continuous, and the recorded electroencephalogram has no reference value.

In the electroencephalogram examination of adults, a plurality of electrodes are firstly fixed at corresponding positions of the head by adopting a tape-bonding mode, then the head is covered by a mesh sleeve, the electrodes are further reinforced, the electrodes are extremely inconvenient to adjust when being operated by patients with different head sizes, time and labor are wasted, the fixing effect is not satisfactory, and the electrodes are not attractive. If the electrode fixing mode is transplanted to a newborn for use, the electrode is easier to shift because the baby is active and the behavior is not easy to control like an adult, and more inconvenience is brought to electroencephalogram examination.

Disclosure of Invention

In view of the above problems, the present invention is directed to an electrode fixing device for electroencephalogram examination, so as to meet the requirements of electroencephalogram examination of infants, accurately and stably position electrodes, and facilitate operation.

In order to achieve the technical effects, the invention adopts the technical scheme that:

an electrode fixture, comprising: fixing base and vacuum chuck, the fixing base is connected in vacuum chuck's the back and the partial absorption face that outstanding to vacuum chuck, the tip that is located vacuum chuck absorption face of fixing base is provided with the fixed slot, electrode detachable install in the fixed slot and with the sealed cooperation of fixed slot, and the outer end position of electrode is less than the distance to the arcwall face edge to the distance on vacuum chuck arcwall face summit, the connecting wire of electrode passes the fixing base and extends outside vacuum chuck's the back.

Further, a plurality of secondary suckers are uniformly arranged on the adsorption surface of the vacuum sucker, and the diameter of the opening of each secondary sucker is not larger than 6 mm.

Further, the secondary suction cup comprises: the vacuum sucker comprises a vacuum sucker, a plurality of independent suckers, linkage suckers and a plurality of air holes, wherein the independent suckers are uniformly distributed in an annular shape at the position, close to the edge, of the suction surface of the vacuum sucker; the vacuum sucker is characterized in that the fixed seat is provided with an air outlet, an air passage communicated with the air hole of each linkage sucker is arranged in each vacuum sucker, the air passage extends into the fixed seat and is communicated with the air outlet, and a one-way valve communicated in one way from the air passage to the air outlet is arranged in the air outlet.

Further, the check valve includes: the seat tube and the one-way valve arranged in the tube cavity of the seat tube, wherein the one-way valve is an elastic film with the thickness smaller than 2mm, the two one-way valves are symmetrically arranged along the axial direction of the seat tube, one end of each one-way valve is connected with the inner wall of the seat tube, the thickness of each one-way valve is gradually reduced towards the other end, the other ends of the two one-way valves extend towards the direction away from the air passage and are attached to each other, and the lateral edges of the two one-way valves are gradually close to and connected to the inner wall of the seat tube on one corresponding side.

Furthermore, the outer end of the one-way valve is provided with an air suction nozzle communicated with the pipe cavity of the seat pipe.

Further, a pressure relief opening communicated with the air passage is further formed in the fixing seat, and a pressure relief valve is arranged in the pressure relief opening.

Further, the pressure relief valve includes: the valve comprises a valve shell, a valve core, a pressure relief pipe and a spring; the valve shell is arranged in the pressure relief opening and enables one end of the valve cavity close to the conical surface to be communicated with the air passage; the valve core is movably arranged in the valve cavity, one end of the valve core is provided with a sealing conical surface matched with the conical surface, one end of the valve core opposite to the sealing conical surface is connected with the pressure relief pipe, and the sealing conical surface is provided with a gas release hole communicated with the pressure relief pipe; the outer end of the pressure relief pipe extends out of the valve shell from the other end of the valve cavity; the spring is sleeved on the pressure relief pipe in the valve shell.

Further, the outer end of the pressure relief pipe is provided with an annular flange.

Further, the fixing base includes: the electrode holder is fixed in the middle of one surface of the elastic diaphragm, which is positioned in the vacuum chuck, the slide rod is fixed in the middle of the other surface of the elastic diaphragm and is axially parallel to the fixed tube, and the sleeve is arranged in the fixed tube and is in sliding sleeve joint with the slide rod; the electrode holder is characterized in that the end part, facing the adsorption surface of the vacuum chuck, of the electrode holder is provided with the fixing groove, the bottom of the fixing groove is provided with a wire passing hole penetrating through the sliding rod, the electrode is installed in the fixing groove and is in sealing bonding with the bottom of the fixing groove, and a connecting wire of the electrode extends out of the sliding rod through the wire passing hole.

Further, the sleeve pipe passes through fine-tuning and fixed union coupling, fine-tuning evenly is provided with three groups along the circumference of fixed pipe, every group fine-tuning includes: the first spherical hinge head, the second spherical hinge head and the adjusting screw rod are arranged on the base; the fixed pipe is provided with a first spherical cavity which is communicated with the inside and the outside, and the surface of the sleeve facing the fixed pipe is provided with a second spherical cavity; the first spherical hinge head and the second spherical hinge head are respectively installed in the first spherical cavity and the second spherical cavity in a spherical hinge matched mode, a through threaded hole is formed in the first spherical hinge head, the adjusting screw rod is in threaded connection with the threaded hole, the inner end of the adjusting screw rod is connected with the second spherical hinge head, and the outer end of the adjusting screw rod is provided with a rotary handle.

Compared with the prior art, the invention has the beneficial effects that:

1. the electrode is arranged on the fixed seat by utilizing the characteristic of less hair on the head of a newborn infant, and the fixed seat provided with the electrode is fixedly adsorbed on the head of the infant by the vacuum chuck, so that the electrode is stably fixed, the electrode cannot be shifted and separated when the head of the infant shakes, and the electroencephalogram examination requirement of the infant is met;

2. the fixing device is designed aiming at a single electrode, and the electrode needs to be sucked, so that the accuracy of positioning the electrode is ensured;

3. how many electrodes need be used and how many fixing device of supporting use, fixed mutually noninterfere between a plurality of electrodes avoids appearing a plurality of electrodes and dragging each other, the inconvenient problem of adjustment when fixed together, labour saving and time saving, convenient operation.

Drawings

FIG. 1 is a first schematic perspective view of an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a second embodiment of the present invention;

FIG. 3 is a schematic top view of an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of section A-A of FIG. 3;

FIG. 5 is an enlarged view of the closed and open state of the check valve at section C of FIG. 4;

FIG. 6 is a schematic cross-sectional view of section B-B of FIG. 3;

FIG. 7 is an enlarged view of the structure of the portion D in FIG. 6;

FIG. 8 is an enlarged schematic view of the closed and open states of the E-section relief valve of FIG. 6;

FIG. 9 is a schematic cross-sectional view of a fixing base according to an embodiment of the present invention;

reference numerals:

100-fixing device, 1-fixing seat, 11-fixing tube, 111-air outlet, 112-pressure relief opening, 113-first spherical cavity, 12-elastic diaphragm, 13-electrode seat, 131-fixing groove, 14-sliding rod, 15-sleeve, 151-second spherical cavity, 16-line passing hole, 17-fine adjustment mechanism, 171-first spherical hinge head, 172-second spherical hinge head, 173-adjusting screw rod, 1731-rotary handle, 2-vacuum sucker, 21-air passage, 3-secondary sucker, 31-independent sucker, 32-linkage sucker, 321-air hole, 4-one-way valve, 41-seat tube, 42-one-way valve, 5-air suction nozzle, 6-pressure relief valve, 61-valve shell, 611-valve cavity, 612-conical surface, 62-valve core, 621-sealing conical surface, 622-air release hole, 63-pressure release pipe, 631-annular flange, 64-spring, 200-electrode and 201-connecting wire.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby. In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referenced components or structures must have a specific orientation, be constructed in a specific orientation, and be operated, and thus are not to be construed as limiting the present invention.

As shown in fig. 1 to 9, the electrode fixing device 100 provided in the present embodiment includes: fixing base 1 and vacuum chuck 2, fixing base 1 connects in vacuum chuck 2's the back and the partial absorption face that extrudes vacuum chuck 2, and fixing base 1's the tip that is located vacuum chuck 2 absorption face is provided with fixed slot 131, and electrode 200 detachable installs in fixed slot 131 and with fixed slot 131 sealing fit, ensures the gas tightness of vacuum chuck 2 absorption face, guarantees that vacuum chuck 2 still can carry out the negative pressure and adsorb behind installation electrode 200. The connecting wire 201 of the electrode 200 extends out of the back surface of the vacuum cup 2 through the fixing base 1 so as to be connected with equipment to transmit the detected brain wave signal. And the distance from the outer end position of the electrode 200 to the top of the arc surface of the vacuum chuck 2 is smaller than the distance to the edge of the arc surface, namely the position of the electrode 200 is close to the top of the arc surface of the vacuum chuck 2, so that the phenomenon that the adsorption surface of the vacuum chuck 2 is inconvenient to contact and adsorb brain skin due to the fact that the electrode 200 is excessively protruded is avoided.

According to the fixing device 100, the electrode 200 is mounted on the fixing base 1 by utilizing the characteristic that hair of the head of a newborn baby is less, the outer end face of the electrode 200 is exposed out of the adsorption face of the vacuum chuck 2 so as to be coated with conductive paste, and then the fixing base 1 provided with the electrode 200 is adsorbed and fixed to the head of the baby through the vacuum chuck 2, so that the electrode 200 is stably fixed, the head of the baby does not shift or separate when the electrode 200 is shaken by the head of the baby, and the requirements of electroencephalogram examination of the baby are met.

Considering that the head of a newborn baby is rare, but the hair of the head of the newborn baby can still cause adverse effect on the adsorption effect of the vacuum chuck 2 at some positions, in order to further eliminate the effect, the embodiment evenly arranges a plurality of secondary chucks 3 with the diameter of the chuck mouth not more than 6mm on the adsorption surface of the vacuum chuck 2, thereby forming a multi-point adsorption structure like an octopus tentacle, and a plurality of small secondary chucks 3 work simultaneously while being adsorbed and fixed by the large vacuum chuck 2, and the multi-point adsorption structure works simultaneously with large and small sets, thereby eliminating the effect of the adsorption effect of all hairs.

As shown in fig. 2 and 7, the secondary suction cup 3 in the present embodiment can be further subdivided into an independent suction cup 31 and a linkage suction cup 32. Specifically, a plurality of secondary suction cups 3 that are cyclic annular evenly distributed at the position that is close to the edge of the suction surface of vacuum chuck 2 are independent suction cups 31, and other secondary suction cups 3 except independent suction cups 31 are linkage suction cups 32, and the difference between the two is that the suction surface top of linkage suction cups 32 is provided with air hole 321. Furthermore, the fixed base 1 is provided with an air outlet 111, the vacuum chuck 2 is provided with an air passage 21 communicated with the air hole 321 of each linkage chuck 32, the air passage 21 extends into the fixed base 1 and is communicated with the air outlet 111, and the air outlet 111 is provided with a one-way valve 4 communicated from the air passage 21 to the air outlet 111 in one way, so that the linkage chuck 32 and the vacuum chuck 2 share one negative pressure cavity. When extrusion vacuum chuck 2 realized adsorbing the negative pressure of head through 4 one-way exhaust of check valve, only need through once extrusion, because the structure of negative pressure chamber intercommunication, when vacuum chuck 2 is effectively sealed attached, perhaps whole linkage sucking disc 32 is effectively sealed attached simultaneously, perhaps when vacuum chuck 2 and arbitrary a plurality of linkage sucking disc 32 are effectively sealed attached simultaneously, can both guarantee the firm head of fixing at the baby of fixing base 1, and the effect is powerful.

And independent sucking disc 31 is as the supplementary of the negative pressure chamber absorption of aforementioned intercommunication, every independent sucking disc 31 can both independently carry out the negative pressure and adsorb, when the follow outside extrusion vacuum chuck 2 adsorbs, arbitrary a plurality of independent sucking discs 31 wherein produce effective absorption, can both realize adsorbing fixedly, even the absorption of vacuum chuck 2 and linkage sucking disc is inefficacy because of the hair, only can also realize effectual fixedly through partial independent sucking disc 31, even at the thick patient head of hair, also can realize effectual absorption fixedly, thoroughly eliminate the influence that the hair all adsorbs the effect, guarantee that can both realize the accuracy to electrode 200 in any position of head, stable location.

The check valve 4 used in the present embodiment, as shown in fig. 5, includes: the seat tube 41 and the one-way flaps 42 arranged in the tube cavity of the seat tube 41, the one-way flaps 42 are elastic films with the thickness smaller than 2mm, the two one-way flaps 42 are symmetrically arranged along the axial direction of the seat tube 41, one ends of the two one-way flaps 42 are connected with the inner wall of the seat tube 41, the thickness of the one-way flaps 42 is gradually reduced towards the other ends, the other ends of the two one-way flaps 42 extend towards the direction far away from the air passage 21 and are attached to each other, and the side edges of the two one-way flaps 42 are gradually close to and connected to the inner wall of the seat tube 41 on the corresponding side.

As shown in b of fig. 5, when the vacuum chuck 2 is pressed to perform air exhaust, the air flow flows from inside to outside (i.e. from the air duct 21 to the air exhaust port 111), the free ends of the two one-way flaps 42 are separated by the pressure of the air flow itself, and the air flow is allowed to pass through, so as to perform air exhaust; after negative pressure is formed in the vacuum chuck 2, as shown in a of fig. 5, the airflow pressure changes from outside to inside (i.e. from the exhaust port 111 to the air passage 21), and the free ends of the two one-way flaps 42 are tightly attached under the action of their own elasticity and negative pressure, so as to prevent the airflow from passing through, achieve the effect of single-row exhaust, and have a simple structure, which is suitable for being used in the environment with a small structure of the present embodiment.

Simultaneously, this embodiment still is provided with the suction nozzle 5 with the lumen intercommunication of seat pipe 41 in the outer end of check valve 4 to can be connected with the negative pressure air supply system in hospital ward through suction nozzle 5, connect the negative pressure pipe and just can directly bleed, it is more convenient than simple hand vacuum chuck 2 and exhaust the absorption, pressure also can be better assurance.

For conveniently carrying out the pressure release to vacuum chuck 2 after the inspection is accomplished in order to dismantle electrode 200, the pressure release mouth 112 with air flue 21 intercommunication is still seted up on fixing base 1 to this embodiment, is provided with relief valve 6 in the pressure release mouth 112, can be convenient elimination negative pressure through relief valve 6.

Referring to fig. 8, the relief valve 6 in the present embodiment includes: a valve housing 61, a valve core 62, a pressure release pipe 63, and a spring 64; a valve cavity 611 with two through ends is arranged in the valve shell 61, a conical surface 612 is arranged at one end of the valve cavity 611, the valve shell 61 is arranged in the pressure relief opening 112, and one end of the valve cavity 611 close to the conical surface 612 is communicated with the air passage 21; the valve core 62 is movably arranged in the valve cavity 611, one end of the valve core 62 is provided with a sealing conical surface 621 matched with the conical surface 612, one end of the valve core 62 opposite to the sealing conical surface 621 is connected with the pressure relief pipe 63, and the sealing conical surface 621 is provided with an air release hole 622 communicated with the pressure relief pipe 63; the outer end of the pressure relief tube 63 extends from the other end of the valve cavity 611 to the outside of the valve housing 61; the spring 64 is fitted over the pressure relief tube 63 in the valve housing 61.

As shown in a in fig. 8, in the negative pressure state, under the dual actions of the spring 64 and the negative pressure, the valve core 62 makes the sealing conical surface 621 of the valve core 62 tightly contact with the conical surface 612 of the valve cavity 611, so as to block the communication between the pressure relief pipe 63 and the air passage 21, ensure the air tightness of the negative pressure adsorption of the vacuum chuck 2, and ensure the effective adsorption for a long time; when pressure relief is needed, as shown in a b diagram in fig. 8, the pressure relief pipe 63 is pulled outwards (i.e. away from the air passage 21), so that the sealing conical surface 621 of the valve core 62 is separated from the conical surface 612 of the valve cavity 611, the pressure relief pipe 63 is communicated with the air passage 21 through the air relief hole 622 on the sealing conical surface 621 of the valve core 62, so that air is sucked inwards through the pressure relief pipe 63, the negative pressure state is relieved, and the vacuum chuck 2 can automatically fall off; to facilitate pulling the pressure relief tube 63 outwardly, an annular flange 631 may be provided at the outer end of the pressure relief tube 63. Meanwhile, when the vacuum chuck 2 is squeezed to exhaust, the internal air pressure may push the valve core 62 to move outwards in a direction away from the air passage 21, and then a state of communicating with the air passage 21 as shown in a b diagram in fig. 8 is formed, so that auxiliary exhaust can be performed through the pressure release valve 6, and the exhaust efficiency is improved.

To facilitate the arrangement of the above structure on the fixing base 1, as shown in fig. 9, the specific structure of the fixing base 1 in the present embodiment includes: fixed pipe 11, elastic diaphragm 12, electrode holder 13, slide bar 14 and sleeve pipe 15, the one end of fixed pipe 11 is connected at the back top of vacuum chuck 2, and link up with the adsorption plane of vacuum chuck 2, and gas vent 111 and pressure release 112 just set up the tip at fixed pipe 11 to suction nozzle 5 and relief valve 6 are all openly exposed, the operation of being convenient for.

The elastic diaphragm 12 is hermetically arranged in a tube cavity at one end, close to the vacuum chuck 2, of the fixed tube 11, the electrode seat 13 is hermetically fixed in the middle of one surface, located in the vacuum chuck 2, of the elastic diaphragm 12, the sliding rod 14 is fixed in the middle of the other surface of the elastic diaphragm 12 and is axially parallel to the fixed tube 11, and the sleeve 15 is arranged in the fixed tube 11 and is in sliding sleeve joint with the sliding rod 14; the end of the electrode holder 13 facing the suction surface of the vacuum chuck 2 is provided with a fixing groove 131, the bottom of the fixing groove 131 is provided with a wire passing hole 16 penetrating through the sliding rod 14, the electrode 200 is installed in the fixing groove 131 and is hermetically bonded with the bottom of the fixing groove 131, and the connecting wire 201 of the electrode 200 extends out of the sliding rod 14 through the wire passing hole 16.

Therefore, by utilizing the elasticity of the elastic diaphragm 12 and the guiding sliding structure of the sliding rod 14 on the sleeve 15, the electrode 200 at the other end can be pushed by the sliding rod 14 to move axially relative to the vacuum chuck 2, when the vacuum chuck 2 is sucked and fixed, the electrode 200 can be effectively contacted with the scalp by pressing the sliding rod 14, and the electroencephalogram detection can be ensured to be carried out smoothly.

On the basis of the structure of the fixing base 1, the present embodiment further connects the sleeve 15 with the fixing tube 11 through the fine adjustment mechanism 17, so as to finely adjust the position of the electrode 200, and thus, the positioning of the electrode 200 is more accurate.

As shown in fig. 3 and 9, the fine adjustment mechanisms 17 are uniformly provided with three groups along the circumferential direction of the fixed pipe 11, and each group of fine adjustment mechanisms 17 includes: a first spherical hinge head 171, a second spherical hinge head 172, and an adjusting screw 173; the fixed tube 11 is provided with a first spherical cavity 113 which is penetrated inside and outside, and the surface of the sleeve 15 facing the fixed tube 11 is provided with a second spherical cavity 151; the first spherical hinge head 171 and the second spherical hinge head 172 are respectively arranged in the first spherical cavity 113 and the second spherical cavity 151 in a spherical hinge matched manner, a through threaded hole is formed in the first spherical hinge head 171, the adjusting screw 173 is in threaded connection with the threaded hole, the inner end of the adjusting screw 173 is connected with the second spherical hinge head 172, so that the sleeve 15 is stably supported through three points, two universal rotating spherical hinge mechanisms formed by the first spherical hinge head 171 and the second spherical hinge head 172 can be used for adjusting the adjusting screw 173 of the three groups of fine adjustment mechanisms 17 in a matched manner, the relative position of the sleeve 15 in the fixed pipe 11 can be changed, the movement of the sliding rod 14 and the electrode 200 at the other end of the sliding rod can be changed, the position of the electrode 200 can be adjusted under the condition that the vacuum chuck 2 is fixed, the vacuum chuck 2 is prevented from being repeatedly disassembled due to deviation in positioning, and the operation is more convenient. And a rotating handle 1731 is preferably provided at the outer end of the adjusting screw 173 to facilitate the rotation of the adjusting screw 173.

The above-described fixture 100 is designed for a single electrode 200, where it is needed to suck, ensuring accuracy and stability of positioning the electrode 200; and how many electrodes 200 need to be used and how many fixing devices 100 are used in a matched manner, the plurality of electrodes 200 are fixed without mutual interference, the problems of mutual dragging and inconvenient adjustment when the plurality of electrodes 200 are fixed together are avoided, time and labor are saved, and the operation is convenient.

It should be noted that the above preferred embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.

Claims

1. An electrode holding device, comprising: the electrode is detachably arranged in the fixed groove and is in sealing fit with the fixed groove, the distance from the outer end position of the electrode to the top point of the arc-shaped surface of the vacuum chuck is smaller than the distance to the edge of the arc-shaped surface, and the connecting wire of the electrode penetrates through the fixed seat and extends out of the back surface of the vacuum chuck;

a plurality of secondary suckers are uniformly arranged on the adsorption surface of the vacuum sucker, and the diameter of the openings of the secondary suckers is not more than 6 mm;

the secondary suction cup comprises: the vacuum sucker comprises a vacuum sucker, a plurality of independent suckers, linkage suckers and a plurality of air holes, wherein the independent suckers are uniformly distributed in an annular shape at the position, close to the edge, of the suction surface of the vacuum sucker; the vacuum sucker is characterized in that the fixed seat is provided with an air outlet, an air passage communicated with the air hole of each linkage sucker is arranged in each vacuum sucker, the air passage extends into the fixed seat and is communicated with the air outlet, and a one-way valve communicated in one way from the air passage to the air outlet is arranged in the air outlet.

2. The electrode fixation device of claim 1, wherein the one-way valve comprises: the seat tube and the one-way valve arranged in the tube cavity of the seat tube, wherein the one-way valve is an elastic film with the thickness smaller than 2mm, the two one-way valves are symmetrically arranged along the axial direction of the seat tube, one end of each one-way valve is connected with the inner wall of the seat tube, the thickness of each one-way valve is gradually reduced towards the other end, the other ends of the two one-way valves extend towards the direction away from the air passage and are attached to each other, and the lateral edges of the two one-way valves are gradually close to and connected to the inner wall of the seat tube on one corresponding side.

3. The electrode holding device of claim 2 wherein the outer end of the one-way valve is provided with an air suction nozzle in communication with the lumen of the seat tube.

4. The electrode fixing device of claim 1, wherein the fixing seat is further provided with a pressure relief port communicated with the air passage, and a pressure relief valve is arranged in the pressure relief port.

5. The electrode fixation device of claim 4, wherein the pressure relief valve comprises: the valve comprises a valve shell, a valve core, a pressure relief pipe and a spring; the valve shell is arranged in the pressure relief opening and enables one end of the valve cavity close to the conical surface to be communicated with the air passage; the valve core is movably arranged in the valve cavity, one end of the valve core is provided with a sealing conical surface matched with the conical surface, one end of the valve core opposite to the sealing conical surface is connected with the pressure relief pipe, and the sealing conical surface is provided with a gas release hole communicated with the pressure relief pipe; the outer end of the pressure relief pipe extends out of the valve shell from the other end of the valve cavity; the spring is sleeved on the pressure relief pipe in the valve shell.

6. An electrode fixation device as claimed in claim 5, wherein the outer end of the pressure relief tube is provided with an annular flange.

7. The electrode fixture according to any one of claims 1-6, wherein the holder comprises: the electrode holder is fixed in the middle of one surface of the elastic diaphragm, which is positioned in the vacuum chuck, the slide rod is fixed in the middle of the other surface of the elastic diaphragm and is axially parallel to the fixed tube, and the sleeve is arranged in the fixed tube and is in sliding sleeve joint with the slide rod;

the electrode holder is characterized in that the end part, facing the adsorption surface of the vacuum chuck, of the electrode holder is provided with the fixing groove, the bottom of the fixing groove is provided with a wire passing hole penetrating through the sliding rod, the electrode is installed in the fixing groove and is in sealing bonding with the bottom of the fixing groove, and a connecting wire of the electrode extends out of the sliding rod through the wire passing hole.

8. The electrode fixing device according to claim 7, wherein the sleeve is connected to the fixing tube via a fine adjustment mechanism, the fine adjustment mechanism is provided with three groups uniformly along a circumferential direction of the fixing tube, and each group of fine adjustment mechanism comprises: the first spherical hinge head, the second spherical hinge head and the adjusting screw rod are arranged on the base;

the fixed pipe is provided with a first spherical cavity which is communicated with the inside and the outside, and the surface of the sleeve facing the fixed pipe is provided with a second spherical cavity; the first spherical hinge head and the second spherical hinge head are respectively installed in the first spherical cavity and the second spherical cavity in a spherical hinge matched mode, a through threaded hole is formed in the first spherical hinge head, the adjusting screw rod is in threaded connection with the threaded hole, the inner end of the adjusting screw rod is connected with the second spherical hinge head, and the outer end of the adjusting screw rod is provided with a rotary handle.